We ended up just grabbing some at the Cancer Council shop. You don't need anything fancy.. just something good enough to catch any poo! You don't need anything absorbent either.. it's only going to fill up with pool water. I guess it's handy to have a bit of absorbency for whilst you're waiting to get in the pool lol - i've been peed on a couple of times!! but really.. it's just something to catch poo that you need.

I did order another swim nappy from somewhere, but haven't used it yet coz it was too big for him. Will probably dig it out this summer. (can't remember what it's called).. I've also got a pair from motherease.